forked from ungleich-public/cdist
completely rewrite file based property handling
Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>
This commit is contained in:
Steven Armstrong
parent
be02dc5ff1
commit
ede35ffd73
1 changed files with 76 additions and 149 deletions
|
|
@ -98,55 +98,6 @@ class FileList(collections.MutableSequence):
|
||||||
self.__write(lines)
|
self.__write(lines)
|
||||||
|
|
||||||
|
|
||||||
class FileListProperty(FileList):
|
|
||||||
|
|
||||||
def __init__(self, path):
|
|
||||||
"""
|
|
||||||
:param path: string or callable
|
|
||||||
|
|
||||||
Usage:
|
|
||||||
|
|
||||||
class Foo(object):
|
|
||||||
parameters = DirectoryDictProperty(lambda obj: os.path.join(obj.absolute_path, 'parameter'))
|
|
||||||
other_dict = DirectoryDictProperty('/tmp/folder')
|
|
||||||
|
|
||||||
def __init__(self):
|
|
||||||
self.absolute_path = '/tmp/foo'
|
|
||||||
|
|
||||||
"""
|
|
||||||
self.path = None
|
|
||||||
self.__path = path
|
|
||||||
|
|
||||||
def _set_path(self, *args, **kwargs):
|
|
||||||
if self.path is None:
|
|
||||||
path = self.__path
|
|
||||||
if callable(path):
|
|
||||||
path = path(*args, **kwargs)
|
|
||||||
if not os.path.isabs(path):
|
|
||||||
raise AbsolutePathRequiredError(path)
|
|
||||||
self.path = path
|
|
||||||
|
|
||||||
# Descriptor Protocol
|
|
||||||
def __get__(self, obj, objtype=None):
|
|
||||||
if obj is None:
|
|
||||||
return self.__class__
|
|
||||||
self._set_path(obj)
|
|
||||||
return self
|
|
||||||
|
|
||||||
def __set__(self, obj, value):
|
|
||||||
self._set_path(obj)
|
|
||||||
try:
|
|
||||||
os.unlink(self.path)
|
|
||||||
except EnvironmentError:
|
|
||||||
# ignored
|
|
||||||
pass
|
|
||||||
for item in value:
|
|
||||||
self.append(item)
|
|
||||||
|
|
||||||
def __delete__(self, obj):
|
|
||||||
raise AttributeError("can't delete attribute")
|
|
||||||
|
|
||||||
|
|
||||||
class DirectoryDict(collections.MutableMapping):
|
class DirectoryDict(collections.MutableMapping):
|
||||||
"""A dict that stores it's items as files in a directory.
|
"""A dict that stores it's items as files in a directory.
|
||||||
|
|
||||||
|
|
@ -178,7 +129,10 @@ class DirectoryDict(collections.MutableMapping):
|
||||||
fd.write(str(value))
|
fd.write(str(value))
|
||||||
|
|
||||||
def __delitem__(self, key):
|
def __delitem__(self, key):
|
||||||
|
try:
|
||||||
os.remove(os.path.join(self.path, key))
|
os.remove(os.path.join(self.path, key))
|
||||||
|
except EnvironmentError:
|
||||||
|
raise KeyError(key)
|
||||||
|
|
||||||
def __iter__(self):
|
def __iter__(self):
|
||||||
return iter(os.listdir(self.path))
|
return iter(os.listdir(self.path))
|
||||||
|
|
@ -187,95 +141,98 @@ class DirectoryDict(collections.MutableMapping):
|
||||||
return len(os.listdir(self.path))
|
return len(os.listdir(self.path))
|
||||||
|
|
||||||
|
|
||||||
class DirectoryDictProperty(DirectoryDict):
|
class FileBasedProperty(object):
|
||||||
|
attribute_class = None
|
||||||
|
|
||||||
def __init__(self, path):
|
def __init__(self, path):
|
||||||
"""
|
"""
|
||||||
:param path: string or callable
|
:param path: string or callable
|
||||||
|
|
||||||
Usage:
|
Abstract super class. Subclass and set the class member attribute_class accordingly.
|
||||||
|
|
||||||
|
Usage with a sublcass:
|
||||||
|
|
||||||
class Foo(object):
|
class Foo(object):
|
||||||
parameters = DirectoryDictProperty(lambda obj: os.path.join(obj.absolute_path, 'parameter'))
|
# note that the actual DirectoryDict is stored as __parameters on the instance
|
||||||
other_dict = DirectoryDictProperty('/tmp/folder')
|
parameters = DirectoryDictProperty(lambda instance: os.path.join(instance.absolute_path, 'parameter'))
|
||||||
|
# note that the actual DirectoryDict is stored as __other_dict on the instance
|
||||||
|
other_dict = DirectoryDictProperty('/tmp/other_dict')
|
||||||
|
|
||||||
def __init__(self):
|
def __init__(self):
|
||||||
self.absolute_path = '/tmp/foo'
|
self.absolute_path = '/tmp/foo'
|
||||||
|
|
||||||
"""
|
"""
|
||||||
self.path = None
|
|
||||||
self.__path = path
|
|
||||||
|
|
||||||
def _set_path(self, *args, **kwargs):
|
|
||||||
#print("_set_path: self: %s" % self)
|
|
||||||
print("_set_path: args: %s" % args)
|
|
||||||
print("_set_path: kwargs: %s" % kwargs)
|
|
||||||
print("_set_path: self.path: %s" % self.path)
|
|
||||||
if self.path is None:
|
|
||||||
path = self.__path
|
|
||||||
if callable(path):
|
|
||||||
path = path(*args, **kwargs)
|
|
||||||
print("_set_path: %s" % path)
|
|
||||||
if not os.path.isabs(path):
|
|
||||||
raise AbsolutePathRequiredError(path)
|
|
||||||
# create directory if it doesn't exist
|
|
||||||
print("os.path.isdir(%s): %s" % (path, os.path.isdir(path)))
|
|
||||||
if not os.path.isdir(path):
|
|
||||||
os.mkdir(path)
|
|
||||||
self.path = path
|
self.path = path
|
||||||
|
|
||||||
# Descriptor Protocol
|
def _get_path(self, instance):
|
||||||
def __get__(self, obj, objtype=None):
|
path = self.path
|
||||||
if obj is None:
|
if callable(path):
|
||||||
return self.__class__
|
path = path(instance)
|
||||||
self._set_path(obj)
|
return path
|
||||||
|
|
||||||
|
def _get_property_name(self, owner):
|
||||||
|
for name, prop in owner.__dict__.items():
|
||||||
|
if self == prop:
|
||||||
|
return name
|
||||||
|
|
||||||
|
def _get_attribute(self, instance, owner):
|
||||||
|
name = self._get_property_name(owner)
|
||||||
|
attribute_name = '__%s' % name
|
||||||
|
if not hasattr(instance, attribute_name):
|
||||||
|
path = self._get_path(instance)
|
||||||
|
attribute_instance = self.attribute_class(path)
|
||||||
|
setattr(instance, attribute_name, attribute_instance)
|
||||||
|
return getattr(instance, attribute_name)
|
||||||
|
|
||||||
|
def __get__(self, instance, owner):
|
||||||
|
if instance is None:
|
||||||
return self
|
return self
|
||||||
|
return self._get_attribute(instance, owner)
|
||||||
|
|
||||||
def __set__(self, obj, value):
|
def __delete__(self, instance):
|
||||||
self._set_path(obj)
|
|
||||||
if value is not None:
|
|
||||||
for name in self.keys():
|
|
||||||
del self[name]
|
|
||||||
self.update(value)
|
|
||||||
|
|
||||||
def __delete__(self, obj):
|
|
||||||
raise AttributeError("can't delete attribute")
|
raise AttributeError("can't delete attribute")
|
||||||
|
|
||||||
|
|
||||||
class FileBooleanProperty(object):
|
class DirectoryDictProperty(FileBasedProperty):
|
||||||
def __init__(self, path):
|
attribute_class = DirectoryDict
|
||||||
|
|
||||||
|
def __set__(self, instance, value):
|
||||||
|
attribute_instance = self._get_attribute(instance, instance.__class__)
|
||||||
|
for name in attribute_instance.keys():
|
||||||
|
del attribute_instance[name]
|
||||||
|
attribute_instance.update(value)
|
||||||
|
|
||||||
|
|
||||||
|
class FileListProperty(FileBasedProperty):
|
||||||
|
attribute_class = FileList
|
||||||
|
|
||||||
|
def __set__(self, instance, value):
|
||||||
|
path = self._get_path(instance)
|
||||||
|
try:
|
||||||
|
os.unlink(path)
|
||||||
|
except EnvironmentError:
|
||||||
|
# ignored
|
||||||
|
pass
|
||||||
|
attribute_instance = self._get_attribute(instance, instance.__class__)
|
||||||
|
for item in value:
|
||||||
|
attribute_instance.append(item)
|
||||||
|
|
||||||
|
|
||||||
|
class FileBooleanProperty(FileBasedProperty):
|
||||||
|
"""A boolean property which uses a file to represent its value.
|
||||||
|
|
||||||
|
File exists -> True
|
||||||
|
File does not exists -> False
|
||||||
"""
|
"""
|
||||||
:param path: string or callable
|
|
||||||
|
|
||||||
Usage:
|
|
||||||
|
|
||||||
class Foo(object):
|
|
||||||
changed = FileBoolean(lambda obj: os.path.join(obj.absolute_path, 'changed'))
|
|
||||||
other_boolean = FileBoolean('/tmp/other_boolean')
|
|
||||||
|
|
||||||
def __init__(self):
|
|
||||||
self.absolute_path = '/tmp/foo_boolean'
|
|
||||||
|
|
||||||
"""
|
|
||||||
self._path = path
|
|
||||||
|
|
||||||
def _get_path(self, *args, **kwargs):
|
|
||||||
path = self._path
|
|
||||||
if callable(path):
|
|
||||||
return path(*args, **kwargs)
|
|
||||||
if not os.path.isabs(path):
|
|
||||||
raise AbsolutePathRequiredError(path)
|
|
||||||
return path
|
|
||||||
|
|
||||||
# Descriptor Protocol
|
# Descriptor Protocol
|
||||||
def __get__(self, obj, objtype=None):
|
def __get__(self, instance, owner):
|
||||||
if obj is None:
|
if instance is None:
|
||||||
return self.__class__
|
return self
|
||||||
path = self._get_path(obj)
|
path = self._get_path(instance)
|
||||||
return os.path.isfile(path)
|
return os.path.isfile(path)
|
||||||
|
|
||||||
def __set__(self, obj, value):
|
def __set__(self, instance, value):
|
||||||
path = self._get_path(obj)
|
path = self._get_path(instance)
|
||||||
if value:
|
if value:
|
||||||
open(path, "w").close()
|
open(path, "w").close()
|
||||||
else:
|
else:
|
||||||
|
|
@ -285,42 +242,15 @@ class FileBooleanProperty(object):
|
||||||
# ignore
|
# ignore
|
||||||
pass
|
pass
|
||||||
|
|
||||||
def __delete__(self, obj):
|
|
||||||
raise AttributeError("can't delete attribute")
|
|
||||||
|
|
||||||
|
class FileStringProperty(FileBasedProperty):
|
||||||
class FileStringProperty(object):
|
|
||||||
"""A string property which stores its value in a file.
|
"""A string property which stores its value in a file.
|
||||||
"""
|
"""
|
||||||
def __init__(self, path):
|
|
||||||
"""
|
|
||||||
:param path: string or callable
|
|
||||||
|
|
||||||
Usage:
|
|
||||||
|
|
||||||
class Foo(object):
|
|
||||||
source = FileStringProperty(lambda obj: os.path.join(obj.absolute_path, 'source'))
|
|
||||||
other = FileStringProperty('/tmp/other')
|
|
||||||
|
|
||||||
def __init__(self):
|
|
||||||
self.absolute_path = '/tmp/foo_boolean'
|
|
||||||
|
|
||||||
"""
|
|
||||||
self._path = path
|
|
||||||
|
|
||||||
def _get_path(self, *args, **kwargs):
|
|
||||||
path = self._path
|
|
||||||
if callable(path):
|
|
||||||
return path(*args, **kwargs)
|
|
||||||
if not os.path.isabs(path):
|
|
||||||
raise AbsolutePathRequiredError(path)
|
|
||||||
return path
|
|
||||||
|
|
||||||
# Descriptor Protocol
|
# Descriptor Protocol
|
||||||
def __get__(self, obj, objtype=None):
|
def __get__(self, instance, owner):
|
||||||
if obj is None:
|
if instance is None:
|
||||||
return self.__class__
|
return self
|
||||||
path = self._get_path(obj)
|
path = self._get_path(instance)
|
||||||
value = ""
|
value = ""
|
||||||
try:
|
try:
|
||||||
with open(path, "r") as fd:
|
with open(path, "r") as fd:
|
||||||
|
|
@ -329,16 +259,13 @@ class FileStringProperty(object):
|
||||||
pass
|
pass
|
||||||
return value
|
return value
|
||||||
|
|
||||||
def __set__(self, obj, value):
|
def __set__(self, instance, value):
|
||||||
path = self._get_path(obj)
|
path = self._get_path(instance)
|
||||||
if value:
|
if value:
|
||||||
with open(path, "w") as fd:
|
with open(path, "w") as fd:
|
||||||
fd.write(str(value))
|
fd.write(str(value))
|
||||||
else:
|
else:
|
||||||
try:
|
try:
|
||||||
os.unlink(path)
|
os.remove(path)
|
||||||
except EnvironmentError:
|
except EnvironmentError:
|
||||||
pass
|
pass
|
||||||
|
|
||||||
def __delete__(self, obj):
|
|
||||||
raise AttributeError("Can't delete attribute. Set it's value to an empty string to remove the underlying file.")
|
|
||||||
|
|
|
||||||
Loading…
Add table
Add a link
Reference in a new issue